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Samsung Galaxy S Duos 2 vs Realme C51 128GB

2G Network GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 SIM1: GSM 850 / 900 / 1800 / 1900SIM2: GSM 850 / 900 / 1800 / 1900  
3G Network HSDPA 900 / 2100 HSDPA 850 / 900 / 2100  
4G Network LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)  
Available Available. Released 2013, December
Dimensions 21.5 x 63.1 x 10.6 mm 167.2 x 76.7 x 8 mm  
Sim Type Dual SIM, dual call (dual stand-by) Dual Sim, Dual Standby (Nano-SIM)  
Weight 118 g 186 g  
Display Type TFT capacitive touchscreen, 16M colors IPS LCD Capacitive Touchscreen, 16M Colors, Multitouch   90Hz, 560 nits (peak)  
Display Size 480 x 800 pixels, 4.0 inches (~233 ppi pixel density) 6.74 Inches   720 x 1600 Pixels (~260 PPI)  
Multitouch Yes
Protection Panda Glass  
Memory 4 GB internal (1.8 GB user available) 128GB Built-in, 4GB RAM  
Card slot microSD, up to 64 GB microSDXC (dedicated slot)  
RAM 768 MB
GPRS Yes Yes
EDGE Yes
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band  
BlueTooth Yes, v4.0 with A2DP v5.0 with A2DP, LE  
USB Yes, microUSB v2.0 USB Type-C 2.0  
NFC Yes  
GPS Yes, with A-GPS support and GLONASS Yes + A-GPS support, & GLONASS, BDS, GALILEO  
Main Camera 5 MP, 2592?1944 pixels, autofocus, LED flash, Video: 720p@30fps Dual Camera: 50 MP, f/1.8, 27mm (wide), 1/2.76", PDAF + 0.08 MP, f/3.0, (depth), LED Flash   HDR, panorama, Video (1080p@30fps)  
Front Camera Yes, VGA 5 MP, f/2.2, 28mm (wide), 1/5", HDR, Video (720p@30fps)  
OS Android OS, v4.2 (Jelly Bean) Android 13 OS  
Chipset Unisoc Tiger T612 (12 nm)  
Processor Dual-core 1.2 GHz Octa-core (2 x 1.8 GHz Cortex-A75 + 6 x 1.8 GHz Cortex-A55)  
GPU Mali-G57  
Sensors Accelerometer, proximity, compass Accelerometer, Compass, Fingerprint (side-mounted), Proximity  
Browser HTML5 HTML5  
Radio Stereo FM radio with RDS
Sound 3.5mm HeadJack, Loud Speaker, MP3/MP4/H.263/H.264/WMV player 3.5mm Audio Jack, Speaker Phone  
Colors White, Black Mint Green, Carbon Black  
Battery Li-Ion 1500 mAh battery (Li-Po Non removable), 5000 mAh   - Fast charging 33W wired, 0-50% in 28 min (advertised)  
StandBy Time (2G) / Up to 280 h (3G)
TalkTime (2G) / Up to 8 h (3G)
Misc Organizer, Document editor, Image editor, Google Search, Maps, Gmail, Calendar, , Voice memo/dial, Predictive text input, Speakerphone SMS(threaded view), MMS, Email, Push Mail, IM   NFC 360? (market/region dependent), Glass front, plastic frame, plastic back, Photo/video editor, Document viewer